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DOI	10.5194/acp-22-13631-2022
	Contributions of primary sources to submicron organic aerosols in Delni, India
	Bhandari, Sahil; Arub, Zainab; Habib, Gazala; Apte, Joshua S.; Ruiz, Lea Hildebrandt
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	13631
结束页码	13657
卷号	22 期号:20 页码:27
英文摘要	Delhi, India, experiences extremely high concentrations of primary organic aerosol (POA). Few prior source apportionment studies on Delhi have captured the influence of biomass burning organic aerosol (BBOA) and cooking organic aerosol (COA) on POA. In a companion paper, we develop a new method to conduct source apportionment resolved by time of day using the underlying approach of positive matrix factorization (PMF). We call this approach time-of-day PMF and statistically demonstrate the improvements of this approach over traditional PMF. Here, we quantify the contributions of BBOA, COA, and hydrocarbon-like organic aerosol (HOA) by applying positive matrix factorization (PMF) resolved by time of day on two seasons (winter and monsoon seasons of 2017) using organic aerosol measurements from an aerosol chemical speciation monitor (ACSM). We deploy the EPA PMF tool with the underlying Multilinear Engine (ME-2) as the PMF solver. We also conduct detailed uncertainty analysis for statistical validation of our results. HOA is a major constituent of POA in both winter and the monsoon. In addition to HOA, COA is found to be a major constituent of POA in the monsoon, and BBOA is found to be a major constituent of POA in the winter. Neither COA nor the different types of BBOA were resolved in the seasonal (not time-resolved) analysis. The COA mass spectra (MS) profiles are consistent with mass spectral profiles from Delhi and around the world, particularly resembling MS of heated cooking oils with a high m/z 41. The BBOA MS have a very prominent m/z 29 in addition to the characteristic peak at m/z 60, consistent with previous MS observed in Delhi and from wood burning sources. In addition to separating the POA, our technique also captures changes in MS profiles with the time of day, a unique feature among source apportionment approaches available. In addition to the primary factors, we separate two to three oxygenated organic aerosol (OOA) components. When all factors are recombined to total POA and OOA, our results are consistent with seasonal PMF analysis conducted using EPA PMF. Results from this work can be used to better design policies that target relevant primary sources of organic aerosols in Delhi.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000870704400001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273702
作者单位	University of Texas System; University of Texas Austin; University of British Columbia; Indian Institute of Technology System (IIT System); Indian Institute of Technology (IIT) - Delhi; University of California System; University of California Berkeley; University of California System; University of California Berkeley
推荐引用方式 GB/T 7714	Bhandari, Sahil,Arub, Zainab,Habib, Gazala,et al. Contributions of primary sources to submicron organic aerosols in Delni, India[J],2022,22(20):27.
APA	Bhandari, Sahil,Arub, Zainab,Habib, Gazala,Apte, Joshua S.,&Ruiz, Lea Hildebrandt.(2022).Contributions of primary sources to submicron organic aerosols in Delni, India.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(20),27.
MLA	Bhandari, Sahil,et al."Contributions of primary sources to submicron organic aerosols in Delni, India".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.20(2022):27.